1081 Reseda
Dark background asteroid
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1081 Reseda (prov. designation: 1927 QF) is a dark background asteroid from the outer regions of the asteroid belt. It was discovered on 31 August 1927, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.[4] The asteroid has a rotation period of 7.3 hours and measures approximately 37 kilometers (23 miles) in diameter. It was named after the herbaceous plant Reseda.[3]
_Reseda.png)
Modelled shape of Reseda from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 31 August 1927 |
| Designations | |
| (1081) Reseda | |
| Pronunciation | /rɪˈsiːdə/[2] |
Named after | Resēda (mignonette) (herbaceous plant)[3] |
| 1927 QF · 1949 UA1 1975 LS | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.85 yr (32,816 days) |
| Aphelion | 3.5567 AU |
| Perihelion | 2.6505 AU |
| 3.1036 AU | |
| Eccentricity | 0.1460 |
| 5.47 yr (1,997 days) | |
| 167.25° | |
| 0° 10m 49.08s / day | |
| Inclination | 4.2029° |
| 30.443° | |
| 7.5205° | |
| Physical characteristics | |
| Dimensions | 31.60±11.05 km[7] 35.66±0.70 km[8] 37.03±8.13 km[9] 37.810±0.219 km[10] 37.89±0.46 km[11] 37.97 km (derived)[12] 40.462±0.470 km[13] |
| 7.3002±0.0006 h[14] 7.30136±0.00001 h[15] | |
Pole ecliptic latitude | |
| 0.0326±0.0026[13] 0.042±0.002[8] 0.043±0.006[10] 0.0488 (derived)[12] 0.049±0.008[11] 0.06±0.02[9] 0.09±0.07[7] | |
| C (assumed)[12] | |
| 11.00[12][7][11] · 11.1[1] · 11.16[9] · 11.30[8][13] | |
Orbit and classification
Reseda is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[5][6] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (1,997 days; semi-major axis of 3.10 AU). Its orbit has an eccentricity of 0.15 and an inclination of 4° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg in September 1927, or 26 days after its official discovery observation.[4]
Naming
This minor planet was named after the herbaceous plant Reseda (also known as "weld", "dyer's rocket" and "bastard rocket") a genus of Old World herbs of the mignonette family. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 102).[3]
Reinmuth's flowers
Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between (1009) and (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).[16]
Physical characteristics
Reseda is an assumed carbonaceous C-type asteroid.[12]
Rotation period
In August 2008, a rotational lightcurve of Reseda was obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 7.3002 hours with a brightness amplitude of 0.34 magnitude (U=3).[14]
Poles
A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database, gave a concurring period of 7.30136 hours, as well as two spin axis of (92.0°, −69.0°) and (256.0°, −76.0°) in ecliptic coordinates (λ, β).[15]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Reseda measures between 31.60 and 40.462 kilometers in diameter and its surface has an albedo between 0.0326 and 0.09.[7][8][9][10][11][13] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0488 and a diameter of 37.97 kilometers based on an absolute magnitude of 11.0.[12]
